Video content
Thus, besides the video of the lecturer (2) it also contains video of the desktop (1). This means that everything presented to the audience will be recorded. If the lecturer switches from slides to web, PDF document, table, text, visualization or simulation program or any application this will be recorded as well.
LeCTo supports recording other video sources as well. For example, in some lectures it is beneficial to record close-ups of things lecturer is doing (experiments, playing instrument, etc.) or operation of a machinery or events in a scene or the audience.
All video recordings are played simultaneously and synchronized. If user jumps to any position in a video, all other videos will be adjusted automatically and instantly (within a second or two).

Lecture notes
Parts of the lecture users might find not to be quite clear or sufficiently descriptive. If the lecturer creates “speaker notes” in PowerPoint, LeCTo will automatically export them in a separate window (3) and they will change as video plays back: in sync with PowerPoint advancement.

Additional HTML content
Lecture notes are simple ASCII text. However, sometimes additional graphical content needs to be presented to users or ability to use web applications.
Lecturer can add link to such a content and LeCTo will present it in a separate window (4) contextually linked to presentation content as lecture advances.

Links
Some users miss prior knowledge required to acquire new knowledge or would like to have more information than presented in the lecture. LeCTo plug-in for PowerPoint allows authors (lecturer) to add links to additional content on the web relevant for the current slide.
LeCTo will export links and present them in separate window (7). They will change contextually as presentation advances, too.

FAQs
Watching the lecture recording might raise some questions in user’s mind and lecturer is not available to immediately answer them (although he could be contacted, via e-mail, for example). However, most of users come to same or similar questions so those frequently asked questions (FAQs) and answers to them can be added to PowerPoint presentation via LeCTo plug-in. LeCTo will display them in another, separate window.

Quiz
An important part of acquiring new knowledge is being sure we do understand it. In order to enable users to verify how much they understand, LeCTo plug-in allows authors to add multiple-choice questions and answers to every slide. LeCTo will automatically present them in a window on the screen (5).

Navigation
In order to learn, users have to be able to quickly access any part of lecture, any content in a random sequence and in a way that does not distract them from learning. To meet these needs, LeCTo offers three navigational methods:

Continuous seeking on the video recording
All other video sources will be synchronized as well as all textual content in their respective windows.

Table of Content
Jumping to “chapters” i.e. slides of PowerPoint presentation used during lecture is facilitated via the table of content presented in a separate window. Clicking on any title will recall content in all windows related to the requested chapter.

Index
All textual content in PowerPoint (slides, speaker notes, links, FAQs) is automatically indexed on user’s request and presented in a separate window in a form of “permuted index” where each term is preceded and succeeded by three immediate words in order to distinguish contexts containing the same word.

Customizing the viewing screen
Window sizes and positions on the screen can be adjusted by the user. They can be turned on or off. These settings can be stored in the .PSU (player set-up) file for future use.

Modifying the rich content
The lecturer can prepare all additional content in advance via PowerPoint plug-in.
Even after the lecture is (video) recorded, the lecturer can modify the content in PowerPoint presentation and re-publish LeCTo recording.
However, LeCTo player enables any user to modify any o f textual content (speaker notes, links, FAQs, quizzes) and store them in a local file. File can be uploaded to LeCTo player next time when users watches the presentation or can be published anywhere on the Internet for other users to use it.
Actually, anybody can create a unique compilation of original video recordings and original and/or modified version of additional content. The compilation is stored in .PSU (player set-up) file which again can be either used locally or uploaded on the net for others to use it.
In this way LeCTo supports four communities: lecturers, users of lectures, authors of additional content and “editors” who compile new LeCTo lectures.